Piezoelectric component

Abstract

A piezoelectric component comprises a parallelepipedal basic body made of piezoelectric material which has an input region and an output region at opposite longitudinal ends of the basic body. Furthermore, the piezoelectric component comprises first and second primary electrodes which are arranged inside the input region and first and second secondary electrodes which are arranged inside the output region. The primary electrodes are at a greater interval from longitudinal lateral faces of the basic body in a subregion which faces the output region than in the subregion which is remote from the output region. Likewise, the secondary electrodes are at a greater interval from the longitudinal lateral faces of the basic body in a subregion which faces the input region than in a subregion which is remote from the input region.

The invention claimed is: 
     
       1. A piezoelectric component comprising:
 a rectangular-parallelepipedal base body composed of a piezoelectric material, the base body having an input region and an output region arranged at opposite longitudinal ends of the base body, wherein the input region is mechanically coupled to the output region, and wherein the base body has a multilayer structure; 
 first primary electrodes arranged in an interior of the input region in the multilayer structure; 
 second primary electrodes arranged in the interior of the input region in the multilayer structure; 
 first secondary electrodes arranged in an interior of the output region in the multilayer structure; and 
 second secondary electrodes arranged in the interior of the output region in the multilayer structure, 
 wherein the first primary electrodes and the second primary electrodes are at a greater distance from longitudinal side faces of the base body in a partial region facing the output region than in a partial region facing away from the output region, and 
 wherein the first secondary electrodes and the second secondary electrodes are at a greater distance from the longitudinal side faces of the base body in the partial region facing the input region than in the partial region facing away from the input region. 
 
     
     
       2. The piezoelectric component according to  claim 1 , wherein the first primary electrodes and the second primary electrodes closest to the output region are at a greater distance from the longitudinal side faces of the base body than the first primary electrodes and the second primary electrodes furthest away from the output region. 
     
     
       3. The piezoelectric component according to  claim 1 , wherein the first secondary electrodes and the second secondary electrodes closest to the input region are at a greater distance from the longitudinal side faces of the base body than the first secondary electrodes and the second secondary electrodes furthest away from the input region. 
     
     
       4. The piezoelectric component according to  claim 1 , wherein a length of the first primary electrodes and the second primary electrodes decreases continuously from the input region in a direction of the output region. 
     
     
       5. The piezoelectric component according to  claim 1 , wherein a length of the first secondary electrodes and the second secondary electrodes decreases continuously from the output region in a direction of the input region. 
     
     
       6. The piezoelectric component according to  claim 1 , further comprising at least one of primary insulating regions, secondary insulating regions and an additional insulating region,
 wherein the primary insulating regions are arranged in the partial region of the input region which faces the output region between the first and second primary electrodes and the longitudinal side faces of the base body, 
 wherein the secondary insulating regions are arranged in the partial region of the output region which faces the input region between the first and second secondary electrodes and the longitudinal side faces of the base body, and 
 wherein the additional insulating region is formed between the input region and the output region. 
 
     
     
       7. The piezoelectric component according to  claim 1 , wherein the multilayer structure comprises a plurality of rectangular-parallelepipedal layers stacked one above another parallel to a top side of the base body, wherein the top side of the base body is defined by one of a largest surface sections of the base body, and wherein the first primary electrodes, the second primary electrodes, the first secondary electrodes, and the second secondary electrodes are arranged between the layers substantially perpendicular to the longitudinal side faces of the base body. 
     
     
       8. The piezoelectric component according to  claim 1 , wherein the second primary electrodes and the second secondary electrodes are each arranged on different layers such that electrodes of the second primary electrodes and the second secondary electrodes have a smallest spatial distance between the first primary electrodes and the second primary electrodes, and the first secondary electrodes and the second secondary electrodes. 
     
     
       9. The piezoelectric component according to  claim 1 , wherein electrodes of the first primary electrodes and the second secondary electrodes are arranged on a first layer of the multilayer structure and electrodes of the second primary electrodes and the first secondary electrodes are arranged on a second layer of the multilayer structure. 
     
     
       10. The piezoelectric component according to  claim 1 , further comprising:
 a first additional primary electrode arranged at least partly in the interior of the input region, wherein the first additional primary electrode is configured to be electrically coupled to the first primary electrodes; and 
 a second additional primary electrode arranged at least partly in the interior of the input region, wherein the second additional primary electrode is configured to be electrically coupled to the second primary electrodes such that the first primary electrodes and the second primary electrodes intertwine in a comb-like manner. 
 
     
     
       11. The piezoelectric component according to  claim 1 , further comprising:
 a first additional secondary electrode arranged at least partly in the interior of the output region, wherein the first additional secondary electrode is configured to be electrically coupled to the first secondary electrodes; and 
 a second additional secondary electrode arranged at least partly in the interior of the output region, wherein the second additional secondary electrode is configured to be electrically coupled to the second secondary electrodes such that the first secondary electrodes and the second secondary electrodes intertwine in a comb-like manner. 
 
     
     
       12. The piezoelectric component according to  claim 1 , further comprising at least one of a first outer primary electrode, a second outer primary electrode, a first outer secondary electrode, and a second outer secondary electrode,
 wherein the first outer primary electrode is arranged on one of the longitudinal side faces of the base body and is configured to be electrically coupled to a first additional primary electrode, 
 wherein the second outer primary electrode is arranged on another of the longitudinal side faces of the base body and is configured to be electrically coupled to a second additional primary electrode, 
 wherein the first outer secondary electrode is arranged on one of the longitudinal side faces of the base body and is configured to be electrically coupled to a first additional secondary electrode, and 
 wherein the second outer secondary electrode is arranged on another of the longitudinal side faces and is configured to be electrically coupled to a second additional secondary electrode. 
 
     
     
       13. The piezoelectric component according to  claim 1 , wherein additional insulating layers are applied on a top side and an underside of the base body. 
     
     
       14. The piezoelectric component according to  claim 1 , wherein the piezoelectric material is polarized in a longitudinal direction of the base body such that a polarization of the piezoelectric material of adjacent sections between at least two of the first primary electrodes, the second primary electrodes, the first secondary electrodes, and the second secondary electrodes is directed oppositely. 
     
     
       15. A transformer comprising:
 a rectangular-parallelepipedal base body composed of piezoelectric material the base body having an input region and an output region arranged at opposite longitudinal ends of the base body, wherein the input region is mechanically coupled to the output region, and wherein the base body has a multilayer structure; 
 first primary electrodes arranged in an interior of the input region in the multilayer structure; 
 second primary electrodes arranged in the interior of the input region in the multilayer structure; 
 first secondary electrodes arranged in an interior of the output region in the multilayer structure; and 
 second secondary electrodes arranged in the interior of the output region in the multilayer structure, 
 wherein the first primary electrodes and the second primary electrodes are at a greater distance from longitudinal side faces of the base body in a partial region facing the output region than in a partial region facing away from the output region, and 
 wherein the first secondary electrodes and the second secondary electrodes are at a greater distance from the longitudinal side faces of the base body in the partial region facing the input region than in the partial region facing away from the input region. 
 
     
     
       16. A method for operating a piezoelectric component, the method comprising:
 providing the piezoelectric component including a rectangular-parallelepipedal base body composed of piezoelectric material having an input region and an output region arranged at opposite longitudinal ends of the base body, first primary electrodes arranged in an interior of the input region, second primary electrodes arranged in the interior of the input region, first secondary electrodes arranged in an interior of the output region, and second secondary electrodes arranged in the interior of the output region; 
 choosing a frequency for operation of the piezoelectric component corresponding to a harmonic oscillation relative to a fundamental oscillation of the base body, wherein the frequency is chosen such that nodes of the harmonic oscillation arise at positions at which at least one of the first primary electrodes, the second primary electrodes, the first secondary electrodes, and the second secondary electrodes are arranged; and 
 exciting the piezoelectric component to oscillate along a longitudinal direction of a base body, wherein the piezoelectric component is operated at the chosen frequency, 
 wherein the first primary electrodes and the second primary electrodes are at a greater distance from longitudinal side faces of the base body in a partial region facing the output region than in a partial region facing away from the output region, and 
 wherein the first secondary electrodes and the second secondary electrodes are at a greater distance from the longitudinal side faces of the base body in the partial region facing the input region than in the partial region facing away from the input region.